Data / Rankings / Population aged 65 and over / Counties in Idaho

Counties in Idaho by share of population aged 65 and over

Lemhi County had the highest share of population aged 65 and over of 44 counties in 2022, at 31.6%. Madison County had the lowest, at 6.3%. The median was 19.5% and the figure for Idaho was 17.5%. Source: the U.S. Census Bureau.

Highest31.6Lemhi County
Lowest6.3Madison County
Median19.544 counties
Idaho17.5History

All counties, 2022

CSVChart (SVG)

Lemhi CountyLemhi County: 31.6 %31.6Adams CountyAdams County: 31.2 %31.2Custer CountyCuster County: 30.6 %30.6Idaho CountyIdaho County: 30.3 %30.3Clearwater CountyClearwater County: 29.9 %29.9Boise CountyBoise County: 27.7 %27.7Valley CountyValley County: 27.4 %27.4Camas CountyCamas County: 27.2 %27.2Bonner CountyBonner County: 26.9 %26.9Lewis CountyLewis County: 26.8 %26.8Washington CountyWashington County: 25.8 %25.8Benewah CountyBenewah County: 25.6 %25.6Boundary CountyBoundary County: 25.3 %25.3Shoshone CountyShoshone County: 25.1 %25.1Butte CountyButte County: 23.9 %23.9Blaine CountyBlaine County: 23.8 %23.8Gem CountyGem County: 23.6 %23.6Nez Perce CountyNez Perce County: 22 %22Bear Lake CountyBear Lake County: 21.5 %21.5Oneida CountyOneida County: 21.2 %21.2Kootenai CountyKootenai County: 21.2 %21.2Payette CountyPayette County: 20.3 %20.3Clark CountyClark County: 18.7 %18.7Caribou CountyCaribou County: 18.7 %18.7Fremont CountyFremont County: 18.6 %18.6Gooding CountyGooding County: 18.6 %18.6Owyhee CountyOwyhee County: 18.3 %18.3Twin Falls CountyTwin Falls County: 17.1 %17.1Minidoka CountyMinidoka County: 16.7 %16.7Ada CountyAda County: 16.6 %16.6Power CountyPower County: 16.6 %16.6Lincoln CountyLincoln County: 16.3 %16.3Bannock CountyBannock County: 15.9 %15.9Bingham CountyBingham County: 15.7 %15.7Cassia CountyCassia County: 15.6 %15.6Franklin CountyFranklin County: 15.5 %15.5Latah CountyLatah County: 15.4 %15.4Canyon CountyCanyon County: 15.1 %15.1Elmore CountyElmore County: 14.9 %14.9Bonneville CountyBonneville County: 14.2 %14.2Teton CountyTeton County: 14 %14Jerome CountyJerome County: 14 %14Jefferson CountyJefferson County: 12.7 %12.7Madison CountyMadison County: 6.3 %6.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2022 (%)Change on 2021
1Lemhi County31.6+0.5 pts
2Adams County31.2+0.1 pts
3Custer County30.6+0.4 pts
4Idaho County30.3+0.3 pts
5Clearwater County29.9+0.5 pts
6Boise County27.7+0.3 pts
7Valley County27.4+0.4 pts
8Camas County27.2+0.6 pts
9Bonner County26.9+0.1 pts
10Lewis County26.8+0.5 pts
11Washington County25.8-0.2 pts
12Benewah County25.6-0 pts
13Boundary County25.3-0.6 pts
14Shoshone County25.1+0.1 pts
15Butte County23.9+0.6 pts
16Blaine County23.8+0.8 pts
17Gem County23.6+0.1 pts
18Nez Perce County22+0.4 pts
19Bear Lake County21.5+0.2 pts
20Oneida County21.2-0.2 pts
21Kootenai County21.2+0.3 pts
22Payette County20.3+0.3 pts
23Clark County18.7-0.9 pts
24Caribou County18.7+0.3 pts
25Fremont County18.6-0 pts
26Gooding County18.6+0.3 pts
27Owyhee County18.3+0.6 pts
28Twin Falls County17.1+0.3 pts
29Minidoka County16.7+0.4 pts
30Ada County16.6+0.5 pts
31Power County16.60 pts
32Lincoln County16.3-0.1 pts
33Bannock County15.9+0.3 pts
34Bingham County15.7+0.3 pts
35Cassia County15.6+0.2 pts
36Franklin County15.5-0.1 pts
37Latah County15.4+0.2 pts
38Canyon County15.1+0.2 pts
39Elmore County14.9+0.5 pts
40Bonneville County14.2+0.3 pts
41Teton County14+0.4 pts
42Jerome County14-0 pts
43Jefferson County12.7+0.2 pts
44Madison County6.30 pts

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

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Rank Counties in Idaho by share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"Idaho","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Idaho&limit=10

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Questions

Which county has the highest share of population aged 65 and over?

Lemhi County, with 31.6% in 2022, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Madison County, with 6.3% in 2022.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in Idaho: more rankings